We are born with innocence in us; but as we become mature and intelligent, we tend to lose the innocence and end up becoming stiff. Drop the stiffness, and then see how much more rewarding, more enjoyable, more interesting life becomes.
Have you noticed what keeps happening in the mind at every moment of time? The mind keeps wondering about what is going to happen next. Knowledge is being aware of this phenomenon of the mind; of what is happening right now in the mind.